Lifting-board for drop-hammers.



G. W. GONKLIN. LIPTING BOARD FOR DROP HAMMERS.

APPLIOAT ION FILED JAN; 7, 1909.

Patented Nov. 23, 1909.

2 SHEETS-SHEET 1.

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APPLIUATION FILED JAN. 7, 1909. I

Patented Nov. 23, 1909.

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GEORGE W. CONKLIN, OF SHELTON, CONNECTICUT.

LIFTING-BOARD FOR DROP-HAMMERS.

Application filed January 7, 1909.

be readily removed and replaced, thus en-- abling me to furnish liftingboards for hammers which will last as long as the hammers themselves,worn strips being replaced by new ones whenever required.

It is of course well understood that the lifting boards of drop hammersare ordinarily integral strips of wood which necessarily wear in use andrequire to be frequently replaced, thereby adding an important item tothe cost of maintenance. My

present invention enables me to do away with the expense and loss oftime required to take down the machine and replace the lifting boardwith a new one, and furthermore to provide lifting boards which shall berelatively inexpensive to produce and shall combine the rigidity anddurability of metal with greatly improved engaging surfaces which aregripped and held firmly by the lifting devices, which will last for analmost unlimited length of time for the reason that the engagement ofthe lifting devices is preferably across the grain of the wood and theindependent strips of which may be readily and quickly replaced andwithout taking down the hammer, whenthey become worn.

With these and other objects in view I have devised the novel liftingboard which I will now describe, referring to the accompanying drawingsforming a part of this specification and using reference characters toindicate the several parts.

Figure 1 is a front elevation of so much of a drop hammer as'isnecessary to illustrate the use in connection therewith of my novellifting board; Fig. 2 an edge view of the lifting board detached; Fig. 3a detail front elevation of a portion of the lift ing board on anenlarged scale, partly broken away; Fig. 4 an edge view of the liftingboard, partly in vertical section; Fig. 5 a

Specification of Letters Patent.

Patented Nov. 23, 1909.

Serial No. 471,133.

plan view of the metal skeleton of the lifting board detached; Fig. 6 adetail elevation of a portion of the skeleton showing the means forlocking the retaining strips; Fig. 7 a section on the line 7-7 in Fig.6; Fig. 8 an inverted plan view of one of the engaging strips detached;andFig. 9 is a perspective illustrating the engagement of a retainingstrip with an engaging strip.

10 denotes the side pieces of a frame of a drop hammer which areprovided with inwardly facing ribs 11 which are received by the ways 12of the hammer, indicated by 13.

14 denotes the lifting board as a whole. At the lower end of the liftingboard is a dove-tail block 15 which engages a corresponding groove inthe top of the hammer.

The lifting board comprises a metal plate which for convenience I termthe skeleton and which is indicated by 16, engaging strips 17 andretaining strips 18. The operative or engaging portion of the skeletonis provided in each face with dove-tail grooves 19 which are preferablyplaced obliquely. These grooves extend from the edges of the skeletoninward to the center, the grooves upon one side preferably incliningupward from the edges to the center and on the other side incliningdownward from the edges to the center, as clearly shown in Fig. 3, whichis partly broken away. The engaging. strips which may be made of wood,vulcanized fiber or any suitable non-metallic material are made ofsuitable size to engage each other closely and are provided on theirinner sides with clove-tails 20 which engage grooves 19.

The dove-tails of the engaging strips are provided with transversegrooves 21 and the ribs, indicated by 22, between the grooves '19 of theskeleton are provided with transverse grooves 23 in alinement therewith,said grooves 28 also extending to the top of the skeleton. The engagingstrips are locked in place by the retaining strips 18 which are slidinto the alined grooves 21 and 23 from the top. The lower ends of theretaining strips rest against the solid metal of the skeleton, asindicated by j dotted lines in Fig. 1. In order to prevent thepossibility of the retaining strips becoming loose and working up, theyare locked in place by studs 24 which pass through the skeleton justabove the retaining strips. One end of is countersunk into the face ofthe skeleton and the other end thereof is threaded and is engaged by anut 26 which is countersunk into the opposite face of the skeleton.

In assembling, the dove-tails upon the engaging strips are slid into thedove-tail grooves in the skeleton from the edges, the inner ends of theengaging strips being chamfered oil so that they will abut against eachother, and the outer ends chamfered off so that they will lie parallelwith the edges of the skeleton. The retaining strips are then slid intogrooves 23 from the top passing through the alined grooves in thedovetails of the engaging strips and the ribs between the dove-tailgrooves of the skeleton. Studs 24 are then passed through the skeletonat the upper ends of the retaining strips and the nuts are turned toplace thereby locking the studs in "place, which in turn lock theretaining strips in place. It will be noted that the retaining stripsand the dove-tails of the engaging strips interlock in such a manner asto make the board as a whole firm and rigid. The engagement of thedove-tails of the engaging strips with the corresponding grooves in theskeleton is close so that the engaging strips can have no lateralmovement, endwise movement of the engaging strips being prevented by theretaining strips.

The use of my novel lifting board is the same as with ordinary liftingboards. The rollers of a lifting device are indicated by dotted lines inFig. 2. As already stated, however, the general construction of thehammer and the operation of the lifting device is wholly immaterial sofar as the present invention is concerned and is therefore notillustrated in the drawings.

Having thus described my invention I claim:

1. A lifting board of the character de scribed, comprising ametallicskeleton having dove-tail grooves on opposite sides and non-metallicengaging strips having clovetails engaging said grooves. I

2. A lifting board of the character described, comprising a metallicskeleton having oblique dove-tail grooves on opposite sides andnon-metallic engaging strips having dove-tails engaging said grooves.

3. A lifting board of the character described,-comprising a metallicskeleton having oblique dove-tail grooves on opposite sides, the groovesupon one side inclining from theedges upward to the center and thegrooves on the opposite side inclining downment and means for lockingthe retaining strips.

6. A lifting board of the character described, comprising a metallicskeleton having dove-tail grooves on opposite sides, ribs between thegrooves and transverse grooves in the ribs, non-metallic engaging stripshaving corresponding dove-tails and trans verse grooves in thedove-tails in alinement with the grooves in the ribs and retainingstrips in said alined grooves whereby the engaging strips are retainedagainst longitudinal displacement.

7. A lifting board of the character described, comprising a metallicskeleton having dove-tail grooves on opposite sides, nonmetallicengaging strips havingcorresponding dove-tails, retaining stripscrossing said grooves and dove-tails to retain the strips againstlongitudinal displacement, and studs in'the skeleton at the ends of theretaining strips for locking the latter in place.

In testimony whereof I affix my signature, in presence of two witnesses.

GEORGE WV. CONKLIN.

Vitnesses PEARL H. ROBINSON, HARRY H. GATLIN.

